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Related Experiment Videos

Protein-polysaccharide biosynthesis. Membrane-bound saccharides.

J G Derge, E A Davidson

    The Biochemical Journal
    |January 1, 1972
    PubMed
    Summary

    Rabbit ear cartilage saccharides show limited chondroitin linkage formation but significant glucuronosyl transfer. Chain extension and sulfation appear closely related in these membrane-associated glycosaminoglycans.

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    Area of Science:

    • Biochemistry
    • Glycobiology
    • Connective Tissue Research

    Background:

    • Papain injection in rabbits induces changes in cartilage composition.
    • Membrane-bound saccharides play roles in cellular processes and tissue structure.

    Purpose of the Study:

    • To characterize membrane-bound saccharides from rabbit ear cartilage.
    • To investigate glycosyl acceptor properties, alkali lability, molecular size, and sulfation.
    • To elucidate the relationship between chain extension and sulfation in these saccharides.

    Main Methods:

    • Isolation of membrane-bound saccharides from rabbit ear cartilage.
    • Assay of glucuronosyl transfer from UDP-glucuronic acid.
    • Analysis of alkali lability and proteolysis for solubilization.
    • Characterization of saccharide composition including xylose, galactose, uronic acid, and N-acetyl-galactosamine.

    Main Results:

    • Considerable glucuronosyl transfer was observed, but less than one-third formed chondroitin linkages.
    • Molecular size had minimal impact on acceptor properties.
    • Approximately 50% of saccharide chains were alkali-labile, while the other 50% required proteolysis.
    • All examined fragments contained stoichiometric amounts of axial sulfate ester.

    Conclusions:

    • Membrane-bound saccharides in recovering rabbit cartilage exhibit complex glycosylation patterns.
    • A strong correlation exists between saccharide chain extension and sulfation.
    • Further research is needed to fully understand the biosynthesis and function of these saccharides.

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